Why do TextBoxes have a TextLength property? Does it offer any advantages over getting the Text’s Length through Text.Length?
Why do TextBoxes have a TextLength property? Does it offer any advantages over getting
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Why do TextBoxes have a TextLength property? Does it offer any advantages over getting the Text’s Length through Text.Length?
Behind this WinForms control is a Win32 edit control.
The Win32 edit control exposes its text through the
WM_GETTEXTLENGTHandWM_GETTEXTmessages. You need to sendWM_GETTEXTLENGTHfirst so that you know how big a buffer to allocate. Then you can sendWM_GETTEXTto populate the buffer.If you just want the length of the text you can obtain it without allocating a buffer by sending just the
WM_GETTEXTLENGTHmessage.The .net control is simply reflecting this underlying control’s behaviour. For a multi-line control with a lot of text, being able to obtain the text length without having to allocate and populate the buffer could be a very useful for performance.